Piston assembly



March 11, 1952 A. J. SLEMMONS 2,588,666

PISTON ASSEMBLY Filed March 10, 1949 3 Sheets-Sheet l I v INVENTOR- I flr/Jzzf J/emmaznsi BY QWEQQTJM iffOP/Yf/Q March 11, 1952 A. J. SLEMMONS PISTON A-SSEMBLY 3 Sheets-Sheet 3 Filed March 10. 1949 INVENTOR.

Patented Mar. 11, 1952 signor to Chrysler Corporation, Highland Park Mich., a corporation of Delaware Application March 10, 1949, Serial No. 80,729

15 Claims.

Thi invention relates to internalcombustion engines of the double acting type. and isprimarily concerned with the .meansemployed toconnect the :pistons of such engines :to the associated crankshaft.

In the double acting type of .engine.adoubleended .piston .is employed for reciprocatory movement in each enginacylinder bore,.such engines being-arranged to-provide acombustion chamber at each end of each cylinder for cooperation with one end of the double-ended piston mounted therein. Engine of this general type are known in the art-and employ a crankshaft which usually extends through and is directlyoperably connected to the double-ended piston without :the use of a connecting rod such as is employed in the more conventional-type of internal combustion engine.

The doubleacting type-of engine offers many advantages over the more conventional types of engines but certain dimculties in the'manufacture,assembly and operation of such an engine have heretofore been deemed to be of such serious and unsurmountable character as to causethis type of engine either to be discarded or considered not worthy of the expenditure of additional effort to overcome the various problems restricting :its use.

One of the difficulties experienced with this typeof engine has been in providing a practicable operating connection between the piston and crankshaftwhich connection willpermit the use of a one-piece or integral type of double-ended piston in combination with an integral or onepiece crankshaft. In the past it has been conventional in this type of engine to use an assembled or built-up type of double-ended piston, such as that disclosed in the application-of John P. Butterfield, Serial No. 16,645, filed March 24, 1948, or an integral type of piston in combination with a built-up or sectional crankshaft such as that disclosed in the-applications of Alexander'G. Herreshoff, Serial No. 16, 801, filed:March 24, 1948, or that "of John -P.Butterfield, Serial No. 16;646, filed March 24,1948. Each of theaforementioned conventional constructions has certain disadvantages which the construction herein disclosed readily overcomes. Anengine assembly using an assembled or built-up type'of double-ended piston with an integral or one-piece crankshaft is costly to manufacture and assemble due to the multiple part piston structure and its assembly is time consuming and subject to various misalignments of the severalpiston parts which misalignments have a tendency torproduce a noisy, inefiicient engine .;-assembly that is characterizedby undue wear anidbindingoif the various slidablyengaged parts. While thislatter type of construction does not present a difiicult assembly problem still, the other disadvantages outweigh its relati ly few advantages. Ina. construction using an integral or one-piece type of .piston inicombinationtwith a built-up or sectional crankshaft, the crankshaft unit is quite costly tomanufactu-re, issubject to increasedvibrational disturbances, and lacks-the necessary rigidity to preventthe development of noise and unnecessary wear. inan engine assembly of thedouble acting type.

The bearing block constructions herein .idisclosed overcome the various disadvantages mereinbefore pointed .out by permitting the1.use-.-of ;a one-piece or integral :type of piston incombination with :an integral or .one-piece crankshaft. Such an arrangement .is easy and :economical -1t0 manufacture, has sufficient z-rigidity to .:maintain the desired tolerances .-.-between :the assembled parts, is not subject to assembly misalignments or the like, and may .be assembled economically with-.ithe greatest cf ease.

Further objects and advantages..:oft.my invention residein the-novel combination and arrangement of parts hereinafter described 'as 'illustrative of the principles of my invention, reference fbeing had to the accompanying drawings' in -which:

Fig. 1 is a transverse sectional elevationalview through a double acting engine cylinder block structure showing a crankshaft and associated 7 piston connected by a bearing block embodying my-invention;

Fig. '2 is :a sectional plan view of the structure shown in Fig. 1, the viewbeingtaken as indicated by line 22 of Fig. 1;

Fig. 3 is a fragmentaryside:elevationalwiew of a portion of the piston and "the bearing "block connection to'the piston slideways;

.Fig. 4 isa fragmentary sectional elevationiof the bearing block structure shown .i-n Figs. Jl and 2,'the view being'takemasjndicatemby the iline 4-4 ofFigJZ;

Figs. 5, 6, 7 and 8 are fragmentarysectional elevational views of modified 'fo'rmsof bearing block constructions embodying my invention;

Fig. 9 is another modified form of'bearingzblock construction including the invention shown in Figs. 1-8 and incorporating means to damp the impact iforces'transmitted between'the piston and associated crankshaft;

Fig. 10 is a sectional elevation of the'bearing block construction shown in=IFig.'9, the viewrbeing taken along thev line l 0- I 0 oil-Fig. 9

Fig. 11 is another sectional elevational view of the bearing block construction shown in Fig. 9, the view being taken along the line l|-|l of Fig. 9;

Fig. 12 is a sectional elevation of another modified form of a sectional bearing block con struction for use with a unitary or one-piece double-ended piston of the internal slideaway yp Fig. 13 is a fragmentary sectional elevation taken along the line |3-|3 of Fig. 12 disclosing the spring strip connecting and clearance adjusting means associated with this sectional bearing block; and

Fig. 14 is an exploded perspective view of the elements comprising the sectional bearing block shown in Figs. 12 and 13.

The engine illustrated in the accompanying drawings is more fully disclosed and claimed in the copending applications of Alexander G. Herreshofi, Serial No. 16,801, filed March 24, 1948, and John P. Butterfield, Serial Nos. 16,645, 16,648 and 16,600, filed March 24, 1948.

In general, the engine comprises a cylinder block structure A formed of component or complementary half portions l and l I having planar face contact in a plane 12-42 which is vertical for the illustrated positioning of the engine in Fig. 1. Each portion of the cylinder block structure A is formed with a half-part of a cylinder |3 of substantially uniform diameter extending between the opposite side faces M of the block structure A. Each exposed end of the cylinder |3 is closed by a cylinder head l providing a combustion chamber I6. Suitable intake and exhaust valves (not shown) control inlet of the fuel mixture to the combustion chambers H1 and discharge of the exhaust gas from the combustion chambers. Combustion chamber fuel ignition means such as the spark plugs l1 are provided although other types of fuel ignition may be used. vThev cylinder block portions Ill and H are brought together and the cylinder heads l5 maintained in their illustrated assembled positions by a plurality of through bolt assemblies l9 which extend through the block portions and cylinder heads. For an engine of the liquid circulating cooled type, as illustrated, the cylinder heads I5 and block portions H), H are provided with cored ,intercommunicating coolant passages 34, the contacting faces of the block portions l0 and H being lapped and wiped with a conventional rubber cement or the like prior to assembly to insure proper alignment of the engine parts and to insure against leakage of coolant and lubricating oil in the plane |2|2;

Reciprocating within the typical illustrated cylinder I3 is a piston structure B having a head portion 35 at each end thereof arranged to cooperate with the combustion chambers l6 of the cylinder heads l5. The piston structure 13 carries a set of rings 36 adjacent each of its head portions 35 and the oppositely disposed piston head portions 35 are connected together by an intermediate skirt structure 31 herein illustrated as comprising a plurality of circumferentially spaced piers or tie-portions 38. The

skirt portion 31 is connected to the associated head portions 35 by suitable connections 39 of the sweated, shrunk, or welded type if the piston is a composite unit having different materials forming the head and skirt portions. If desired, the integral or one-piece piston structure 13 may be formed as a single casting or as a unitary center pier and track section with attached ring carriers, or as a composite unit, such as shown in the application of Alexander G. Herreshofi, Serial No. 84,081, filed March 29, 1949 now Patent No. 2,581,326 issued January 1, 1952 The skirt portion 31 of piston structure B is provided with two pairs of diametrically disposed, axially extending openings or slots 45 and 45, respectively, which slots are bounded circumferentially of the piston by the piers 38. The slots 45 are adapted to receive the crankshaft 22 and to accommodate reciprocation of the piston structure B relative to the crankshaft 22. Crankshaft 22 is rotatable about its axis 40, the crankshaft having journal portions 41 mounted in bearings 48 carried by the component semicylindrical bearing openings 48' formed in the cylinder block portions I0 and II. The slots 46, circumferentially rotated ninety degrees from the slots 45 (see Fig. 3), are adapted to receive the end portions of the internal piston slideways 5| and are arranged to facilitate assembly of the piston structure B on the crankshaft crankpin portion 23, all as more fully explained subsequently.

Associated with each cylinder and piston structure of the engine is a cylindrical crankpin portion 23 of the crankshaft 22, such portion having its axis 49 offset from the crankshaft axis 40 and parallel therewith. Each crankpin portion 23 is connected to an adjacent pair of journal portions 41 by the obliquely extending crankshaft portions 24, the crankpin 23 and oblique connecting portions 24 being disposed within the hollow chamber formed interiorly of piston structure B intermediate the heads 35 of the double-ended piston structure. It will be apparent that the cylindrical crankpin portion 23 presents a cylindrical journal bearing surface of revolution having the crank axis 49 as its axis of generation.

My improved operating connection between piston structure B and crankshaft 22 comprises internal slideways or bearing guides 5| carried by each piston head portion 35 and extending transversely of the piston structure B and a hearing structure or block D operatively disposed between crankpin 23 and the piston slideways 5|, the parts being so constructed and arranged as to provide a sliding rocking bearing connection between the piston structureB and the crank: shaft crankpin 23. The similar, opposed, companion slideway portions 5| are preferably cast with the piston heads 35 and connected therewith by the X-brace structure formed by the flanges or webs 54, 55 each of which is swept into its associated guideway portion 5| in order to fix the slideways 5| as a more or less rigid part of the piston head structure. By the arrangement shown the slideway portions 5| are thus spaced from each other in a direction axially of the piston structure and present opposed, arcuately shaped bearing surfaces 58 facing each other.

The slideways 5| extend transversely of the piston structure B parallel to an axis 56 which is normal or perpendicular with the cylinder and piston axis I8 and with the axis 49 of crankpin 23. Each slideway portion 5| is provided with an arcuately shaped bearing surface of revolution 58 having its longitudinally extending surface elements extending parallel with the slideway axis 56 and perpendicular to the piston axis l8, the surfaces 58 being of arcuate formation as viewed in planes extending transverse to the slideway axis 56. Each bearing surface 58 I accepts is :a portion of acylindrical surface having axis 56 "as 'the axis of such cylinder about which Y the surfaces 58 are developed or generated. uas'will be seen from Figs. 2 and 3 the slideways 5I extend transversely through the piston, the opposite -ends of the slideways 5| being open and extending outwardly through the slots =16 -lo'cated between the piers -38 of the piston skirt portion-3I.

The bearing block structure D disclosed &in Figs. 1-4comprisescomplementary bearing block portions SI and *62, having stepped contacting side faces 63 and -64, "respectivelypwhich faces are arranged'to extend transverselyof and normal to theparallel, cylindrically formedfbearing surfaces 65, 65'on the ends of block portions 6| and 62. The cylindrical-bearing surfaces 65, 65'-'are-generated-about the axis 56 of the slideways -'5I so as to conform to the curvature of the *slideway bearing surfaces 58. =Bearing=surfaces65, 65' are adapted to =be'slidably-and' rockably-received in the piston slideways 5I for -mating engagement with the slideway bearing surfaces-58. Each of the bearing block portions BI and '62 has a side face thereof formedwith 'a semi-ciylindrical crank portion journal opening 66 and 61, respectively, which openings are adapted "to be mounted about the associated crankshaftcrankpin'portion 23. The semi-cylindrical journal-surfaces 66 "and 61 are generated about the axis '49 of the "crank portion 23 so as to provide a journal-bearing fit. Each of the bearingblock portionstl and'62 is provided with a pair'of boltreceivingbores B8 and-69, respectively, adapted to receive the tie bolts I0. Tie bolts I have their heads countersunk in the openings 58 inbearing blockiportion BI and their threaded end'portions connected to the threaded bores 59 of bearing'block'portion'62 was to lock the bearing blockportions in assembled position about the crank portion 23. The stepped faces 63 and 6410f the bearing "block portions GI and 62 provide means to align the bearing faces 65, 65' and the journal openings 66 and 61 and to maintain this alignment without relying on any centering action of the tie bolts I0. It is necessary th'at'the bearing surfaces -65,65 on the adjacent bearing "block portions ateach end of the bearing block be aligned to prevent 'a scraping or wiping action as "the bearingblock reciprocates across the slidewaysl. To prevent any possible wipingaction atthe joining .edges of the bearing block surfaces 65, .65 the edges of the 'block portions maybe chamfered as shown at .65". Bearing'blocks D are axially shiftable'on the crankpin portions "23 .to permit self-alignment of ithepiston B relative to the cylinder I3 and crankshaft 22. The construction shown in Figs.

1-4 having the bearing block portions'split along a plane perpendicular to the bearing surfaces of the block portions permits assembly 'of a onepiece piston on a one-piece crankshaft "in an easy and economical manner.

The modified form of bearing block'shown in Fig. '5 differs from the form shown in Fig. 4 in 'that'the contacting faces 'of the bearing block portions II and I2 are not steppedbut instead include pin receiving channels 13 to seat the aligning pin I4 which maintains alignment of the bearing surfaces I9, I9 and the journal bearing openings .15 and .IB. Eachbearingblock portion II and I2 includes bores 11 to receive thetie bolts "I8.

"The .Eiglfi modification dispenseswith the self 'aligning'formations in the contacting faces of the"bearin'gblockportions8 I and *82 and'accom- 6 plishes this alignment of the bearing-surfaces 83, 83 "and journal-openings-81 :and- 88 bymeans df a pilot portion 84 on tie bolt 85 that is threadably mounted in the aligned bores "BB-of the engaged bearing block portions BI and 82.

Fig. 7 shows a modified form of the Fig. 4 and'5 constructions having serrated mating faces SI and -92 on the bear'ing blockportions'93 and 94, respectively, cooperating with the tie-bolt95 mounted in the aligned bores 96 to align the bearing surfaces 09, 99 and the journal openings'9'1 and '98.

'8 is anothermodifica'tion whereinthe be'aring'block portions IOI and I 02 are each'formed with a transversely as wellas a longitudinally curved bearing surface I03, I03 to engage "the sli'deway bearing surfaces -"5I3. This arrangement provides a chamfered"construction 104 at the meeting edges of the bearing surfaces I03, I03 that prevents a wiping action. -A conventional tie bolt I05 is mounted in the "bores I01 to lock the bearing block portions about the crankpin 23. The Fig. 8 construction is of a simple form that does not require specially machined aligning portions on'the contacting'faces of the mating bearing block portions nor are special bolts or bolt bores required to assure 'a non-wiping action between the bearing block and the slideway bearing surfaces 58.

Figs. 9-11 show another form of the invention wherein the bearing block D comprises a pair of complementary bearing block portions I II each of which has at the opposite ends parallel, arcuately formed, bearing surfaces II2 adapted tobe mounted in the spaced piston slideways 5'I for slidable engagement with the mating slideway bearing surfaces 58. The bearing surfaces II2 are formed in the manner previously described with regard to the bearing surfaces 65, 05 so that they will matingly engage the cylindrically curved slidway bearing surfaces 58. Each bearing block portion I II is formed with a portion of a crankpin journal opening I'I3 extending inwardly from one side face thereof, the complementary journal openings II3 being arranged to fit about the crankshaft crankpin portion 23 and to be slightly spaced therefrom when in assembled position. Tie bolts II4, like any of the forms shown in Figs. 4-8, may be used to fasten the complementary bearing block portions I I I about the crankpin-portion 23. The journal surfaces of the journal openings I I 3 in the bearing block portions I I I are formed witha crisscrossed arrangement of oil passages H5 and bores II6 connect the oil passages II5 with the adjacent bearing surfaces II2. Mounted on the journal face II3 of each bearing block portion I I I and projecting radially inwardly therefrom is an anchor pin I I8. Anchor pins I I8 are adapted to non-rotatably support the cylindrical bearing shell I20 which journals the crankpin 23 of the crankshaft. Bearing shell I20 is adapted to be floatingly supported in concentrically arranged oil films that are formed in the space I25 betweenthe journal faces II3 of the bearing block portions II I and the bearing shell I20 andin the space I25 between the bearing shell I20 and the journal surfaces on the crank portion 23. Bearing shell I20 is perforated to 'provide the spaced oil bores I22 which connect the oil supply passage 25 in crank portion 23 with the oil passages II5, the oil bores H6 and the bearing surfaces H2. The'bearing shell I20 has side flanges I2 I arranged to fit closely against the outer sides of the bearingblock portions II-I as The usual oil wedge film is maintained in the space I26 between the crank portion 23 and bearing shell I20. By the construction shown in Figs. 9-11 fluid pressure means are provided for damping of the impact force due to the taking up of the clearance in the crankpin journal during firing in the combustion chamber and a reliable lubricating system is provided for servicing all movable portions of the bearing block con struction. The clearances shown between the various elements are shown greatly enlarged for the sake of clarity.

The bearing block construction shown in Figs. 12-14 comprises complementary crankpin journal block portions I3I and I32. Each of the block portions I3I and I32 is provided with a pair of slots I33 and 134, respectively, that extend across the end surfaces of the block portions I3I and I32 in a direction parallel to the axis of the crankpin journal openings I35 and I36, respectively; in these block portions. Each of the crankpin journal openings I35 and I36 is formed with an anchor slot I3! and I38, respectively, to provide means to non-rotatably anchor a section of the two-piece bearing shell I39 to the block portions I3! and I32. Portions of each bearing shell section are forced into one of the anchor slots in block portions I3I and I32 in a manner known to the art and forming no part of this invention. A pair of bearing block end members MI and I42, which are adapted to extend across the opposite end surfaces of the crankpin journal block portions I3I and I32, are each formed with a pair of slots I43 and I44, respectively, arranged to be aligned with the slots I33 and I34 in block portions I3I and I32 when the several bearing block elements are assembled about the crankshaft crankpin portion 23. Bearing block end members MI and I42 each have an arcuate bearing surface I45 and 146, respectively, that is adapted to seat in a mating bearing surface 58 of the associated piston slideway i. Arcuately shaped spring strips I49 of substantially rectangular cross-sectional configuration are adapted to be inserted in the aligned slots I33, I34, 83 and I44 to connect the several bearing block elements in assembled relationship. The curved spring strips I49 are shaped so as to tend to force the bearing block end members MI and H42 away from the crankpin journal blocks I3I and I32 and into a tight fit with the piston slideway bearing surfaces 58. This spring action of the strip 149 compensates for variations in clearance between the bearing block bearing surfaces I45 and I46 and the piston slideway surfaces 5 8 and tends to reduce noise and always maintain a close sliding fit between the bearing block and piston slideways. Furthermore, the minute spaces I50 between the end surfaces of the crankpin journal block portions I3I and 32 and the adjacent inner sides of the end members I4I and I42 provide channels for retaining films of lubricating oil or the like and these oil films act as cushioning means to damp impact forces applied to the piston due to fuel combustion or the like. To further assist in the mountin of the end members MI and 42 on the journal blocks I3I and I32 and to also maintain these block portions in aligned assembled relationship, the several block elements may be provided with aligning tongue and groove connections such as the tongues I53 and I54 on the crankpin journal blocks I3I and I32 and the grooves I55 and I56 in the end members IM and I42 respectively.

. By the construction shown in Figs. 12-14 a sectional bearing block has been provided that may be easily assembled on a crankshaft mounting, a one-piece, double-ended, internal slideway type piston and the bearing block will automatically compensate for variations in clearances between the bearing block slide surfaces and the piston slideway due to the action of the spring strip connecting means I49 between the several elements of the bearing block. Also, this sectional bearing block provides channels for retaining oil films that act as impact damping means to absorb the forces that would otherwise be applied to the crankshaft crankpin and its associated elements.

It is thought to be obvious from a consideration of Figs. 2 and 3 of the drawings that the use of an integrally formed one-piece or unitary piston structure, such as that identified by the reference numeral B, having curved, transversely extending, internals slideways, such as the slideways 5|, prevents the use of the conventional built-up bearing block structure that is formed from complementary portions separable along a plane extending parallel to the bearing surfaces of the block D and the slideways 5I. In a piston construction of the type herein disclosed, the curvature of the bearing surfaces 58 on the slideways 5I and the mating surfaces on the bearing block D prevents mounting of the complementary bearing block portions on the crankshaft 22 from the sides of the piston adjacent the slots 45 in the piston skirt 31. As the piston B is of the one-piece or integral type, it must first be mounted on the crankshaft 22 and then the complementary bearing block sections mounted on the crankshaft crankpin portion 23 between the piston slideway surfaces 58. Use of a one-piece crankshaft prevents first mounting the bearing blocks in the piston slideways and the subsequently attempting to thread the crankshaft through the bearing block crank portion journal openings as may be done when using a built-up crankshaft. v

The bearing block constructions herein disclosed permit mounting of the bearing block D on the crankshaft crankpin portions 23 after the crankshaft 22 has been threaded through the piston skirt portion 31 of the unitary piston B so as to extend between and at right angles to the direction of the piston slideway portions .5I. After mounting the crankshaft 22 in the piston B as aforedescribed the complementary portions of the bearing block D may be slidably inserted through the slots 46 on opposite sides of the piston skirt 31 and into the oppositely disposed open ends of the slideways 5|. After mounting the complementary bearing block portions in the slideways 5I with the crankpin journal openings fitted about the crankpin portion 23, the connecting tie bolts for the complementary bearing block portions are inserted through the appropriate piston skirt slots 46 and threaded into the receiving openings in the bearing block portions to lock the complementary bearing block portions about the associated crankpin portion 23. By the herein disclosed construction of a bearing block structure, a connecting means for operably associating a one-piece, double-ended pistonwith a one-piece crankshaft has been provided that is easy and economical to manufacture and assemble and" one that will.lend itselfto smooth, noiseless. emcient', engine operation. Further- Figs. 9-11 of the drawings'provides, in addition, a. means. for properly lubricating the' bearing block. construction and. damping. the impact loads created byignition of" the fuel charges in the engine combustion chambers. 124 .4 construction'a sectional'bearing block construction has been provided'in' which. the bearing' block includes means to assistin control of the clearances. between. the bearing. surfaces of thebearing block and the mating bearing surfaces 58 on the piston slideways 5]. The Figs. 12-14 construction also. includes additional means. providing oil films. for damping impact loads.

Iiclaim:

1. A bearing blockv structure adapted to connect a crankpin portion .to the spaced parallel,

arcuately shaped; slideways. of a movable structure comprising a pair of complementarybearing block portions, each bearing block portion having a pair of spaced parallel ends formed to provide arcuate y shaped bearing surfaces anda side face extending transversely of and normal to the spaced block ends. said side face beingformed with a portion'ofa cylindrical crankpin journal openin extending inwardly therefrom, and connecting means extending between said bearing block portions in planes parallel to said block ends adapted to fasten thecomplementary bearing block portions together with said side faces in engaging relationship and the complementary portions of the crankpin journal openings assembled in ali ned relationship.

2'. A. hearing block structure adapted to connect, a crankpin portion to the spaced parallel, arcuately shaped slideways of a piston structure or the like comprising a pair of' complementary bearing block portions. each bearing. block portion having a pair of spaced parallel ends formed tov provide arcuately shaped bearing surfaces and a side face extending transversely of and normal to. the, spaced block ends, said, side face being formed with a portion. of a cylindrically shaped crankpin journal" opening extending inwardly therefrom, and connecting means extending be- .or the like comprising a. pair of. complementary bearingblock portions, each bearing. block portion havinga pair of spaced. parallel. ends formed to. provide arcuately shaped bearingsurfaces and a.- side. face. extending transversely of and. normal to; the spaced; block. ends;v said side. facebeing formed. with: a portion. of; a; cylindrically shaped crankpin J'pfurnal';- opening; extending: inwardly therefrom, and: connectingmeans, extendin v be.-

twaem sari:bearing; block: portions; adaptediito.

mor.e, the particular construction disclosed. in

I By the Figs.

fastenthe complementary bearing block portions together with said side faces in engaging'relationship andcthe portions of the crankpin journal openings assembled in aligned relationship, said engaged side faces of said complementary bearing block portions having complementary aligning formations thereon adapted to align the bearing surfaces and the crankpin journal openings on the complementary bearing block portions, said aligning formations comprising complementary engageable step formations.

4; A bearing block structure adapt'edto connect a crankpin portion to the spaced, parallel, arcuately shaped slideways of a piston structure or" the like comprising a pair of complementary bearing block portions, each bearing block portion having a pair of'spacedparallel ends formed to provide arcuately shaped bearing surfaces and a side face extending-transversely of and normal to' the spaced block ends; said side face being formed with a portion of a cylindrically shaped crankpin journal opening extending inwardly therefrom, and connecting means extending between said bearing block portions adapted to fasten the complementary bearing block portions together with said side faces in engaging rel'ationship andthe portions of the crankpin journal openings assembled in aligned relationship; said engaged side faces of said complementary bearing block portions having complementary align- I bearingblock portions, each bearing block portion having a pair of spaced parallel ends formed to provide arcuately shaped, bearing surfaces and a side face extending transversely of and normal 1 to the spaced block ends, said side face being formed with a portion of a cylind'rically shaped crankpin journal opening extending inwardly therefrom, and connecting means extending between said bearing block portions adapted to fasten the complementary bearing block-portions together with said side fa es in en aging relationship and the portions of the crankpin journal openings assembled in aligned relationship, said engaged side faces of'said complementary bearing block portions having complementary aligning formations thereof ada ted to align the bearing surfaces and the crankpin journal openings on the. complementary bearing block portions, said aligning formations comprising complementary, engageable, serrated formations.

61A bearing blockstructure adapted to connect a. crankpin portion to the spaced, parallel, arcuately shaped slideways of a piston structure or'the .l'ikecomprising a pair of complementary bearing block: portions, each bearing block'portion having. a pair of s aced parallel end's formed to provide. arcuately shaped bearing surfaces and a side face extending transversely of and normal to the spaced block ends, said side face being formed. with a portionof a cylindrically shaped crankpin journal opening extending inwardly therefrom, and; connecting: means:- extending 'between. said bearing; block portions adaptedjto fasten. the con'lplemeritary"bearing block: portions together withsaidisidefaces in. engagingrrelation- .1 ship and? the portions of the; crankpin; journal openings assembled in aligned relationship, said engaged side faces of said complementary bearing block portions having complementary aligning formations thereon adapted to align the bearing surfaces and the crankpin journal openings on the complementary bearing block portions, the ends of said engaged side faces of the complementary block portions adjacent said bearing surfaces being chamfered.

7. A hearing block structure adapted to con- ,nect a crankpin portion to the spaced, parallel,

arcuately formed slideways of a piston structure or the like comprising a pair of complementary bearing block portions, each bearing block portion having a pair of spaced parallel ends formed to provide opposed, arcuate bearing surfaces and a side face extending transversely of and normal to the spaced block ends, said side face being formed with a portion of a cylindrically shaped crank pin journal opening extending inwardly therefrom, and connecting means extending between said bearing block portions adapted to fasten the complementary bearing block portions toget er with said side faces in engaging relationship and the portions of the journal openings in ali ned relationship, said connecting means comprising tie bolts mounted in aligned bores in the complementary bearing block portions, the

tie bolts including pilot portions adapted to engage the bores and align the bearing surfaces and the crankpin journal openings on the complementary bearing block portions.

8. A bearing block structure adapted to connect a crankpin portion to the spaced, parallel,

arcuately shaped slideways of a piston structure or the like comprising a pair of complementary bearing block portions, each bearing block portion having a pair of spaced, parallel ends formed toprovide opposed. arcuately shaped bearing surfaces and a side face extending transversely of and normal to the spaced block ends, said side face being formed with a portion of a cylindrically shaped crankpin journal opening extending inwardly therefrom, and connecting means extending between said bearing block portions and arranged parallel to the block end surfaces and adapted to fasten the complementary bearing block portions together with said side faces in engaging relationship and the portions of the journal openings in aligned relationship, the ends of said blocks adjacent said engaged side faces .being shaped to provide a chamfered formation that extends inwardly towards the crankpin jour- ,nal openings in said block portions.

9. A hearing block structure adapted to connect a crankpin portion to the spaced, parallel ,slideways of a piston structure or the like comprising a pair of complementary bearing block ,portions, each bearing block portion having a pair of spaced parallel ends formed to provide bearing surfaces slidably engageable with said slideways and having a side face extending transversely of and normal to the spaced block ends, said side face being formed with a portion of a crankpin journal surface extending inwardly therefrom, and connecting means extending bethe bearing surfaces along the ends of the hearing block portions.

10. A bearing block structure adapted to connect a crankpin portion to the spaced, parallel slideways of a piston structure or the like comprising a pair of complementary bearing block portions, each bearing block portion having a pair of spaced parallel ends formed to provide bearing surfaces slidably engageable with said slideways and having a side face extending transversely of and normal to the spaced block ends, said side face being formed with a portion of a crankpin journal surface extending inward- 1y therefrom, and connecting means extending between said bearing block portions adapted to fasten the complementary bearing block portions together with said side faces in engaging relationship and the portions of the crankpin journal surfaces assembled in aligned relationship, said bearing block portions each including lubricant receiving passages formed in the crankpin journal surfaces and lubricating bores connecting surfaces along the ends of the bearing block portions, each bearing block portion having an anchor pin extending radially inwardly from the crankpin journal surface formed therein and adapted to non-rotatably support a cylindrical bearing shell.

11. A bearing block structure adapted to connect a crankpin portion to the spaced, parallel slideways of a piston structure or the like comprising a pair of complementary bearing block portions, each bearing block portion having a pair of spaced parallel ends formed to provide bearing surfaces slidably engageable with said slideways and having a side face extending transversely of and normal to the spaced block ends, said side face being formed with a portion of a crankpin journal surface extending inwardly therefrom, and connecting means extending between said bearing block portions adapted to fasten the complementary bearing block portions together with said side faces in en aging relationship and the portions of the crankpin journal surfaces assembled in aligned relationship, said bearing block portions each including lubricant receiving passages formed in the crankpin journal surfaces and lubricating bores connecting said lubricant receiving passages to the bearing surfaces along the ends of the bearing block portions, each bearing block portion having an anchor pin extending radially inwardly from the crankpin journal surface formed therein and adapted to non-rotatably support a cylindrical bearing shell, and a cylindrical bearing shell mounted on said anchor pins and concentrically' arranged within the crankpin journal surfaces of said bearing block portions but spaced therefrom, said bearing shell having perforations therein arranged to establish communication between said bearing shell surfaces and the bearing surfaces on the ends of the bearing block portions via said lubricant receiving passages and said lubricant bores.

12. A bearing block structure adapted to connect a crankpin portion to the spaced parallel slideways of a piston structure or the like comprising a pair of complementary bearing block portions,- each bearing block portion having a pair of spaced parallel ends formed to provide bearing surfaces slidably engageable with said slideways and having a side face extending transverselyofand normal to the spaced block ends, said side face being formed'witha portion of a crankpin journal surface extending inwardly therefrom, and connecting means extending between said bearing block portions adapted to fasten the complementary bearing block portions together with said side faces in engaging relationship and the portions of the crankpin journal surfaces assembled in aligned relationship, said bearing block portions each including lubricant receiving passages formed in the crankpin of said bearing block portions but spaced there- I from, said bearing shell having perforations therein arranged to establish communication between said bearing shell surfaces and the bearing surfaces on the ends of the bearing block portions via said lubricant receiving passages and said lubricant bores, said bearing shell having radially extending side flanges arranged adjacent the sides of said bearing block portions to restrict the axial flow of lubricant from between the bearing shell and the journal surfaces of said bearing block portions.

13. In combination, a crankpin having an oil supply bore extending therethrough, a perforated bearing shell mounted concentrically about and spaced from said crankpin and a bearing block structure mounted on said bearing shell and adapted to be slidably connected between a pair of spaced slideways comprising a pair of complementary bearing block portions, each bearing block portion having a pair of spaced parallel ends provided with surfaces adapted to be slidably engaged with said slideways and a side face extendin transversely of and normal to said block ends. said side face being formed with an opening providing a journal surface to seat a portion of said crankpin bearing shell, means connecting said bearing block portion together, anchor pin means mounted on the journal surface of each bearing block portion adapted to non-rotatably support said bearing shell on said bearing block structure in spaced relation to the crankpin journal surface formed therein, lubricant receiving channels formed along the crankpin journal surfaces of said block portions, and bores connecting said lubricant receiving channels to the bearing surfaces on the block ends.

14. In combination, a crankpin having an oil supply bore extending therethrough, a perforated bearing shell mounted concentrically about and spaced from said crankpin, and a bearing block structure mounted on said bearing shell and adapted to be slidably connected between a pair of spaced slideways comprising a pair of complementary bearing block portions, each bearing block portion having a pair of spaced parallel ends provided with surfaces adapted to be slidably engaged with said slideways and a side face extending transversely of and normal to said block ends, said side face being formed with an opening providing a journal surface to seat a portion of said crankpin bearing shell, means connecting said bearing block portion together, anchor pin means mounted on the journal surface of each bearing block portion adapted to non-rotatably support said bearing shell on said bearing block structure in spaced relation to the crankpin journal surface formed therein, lubricant receiving channels formed along the crankpin journal surfaces of said block portions, and bores connecting said lubricant receiving channels to the bearing surfaces on the block ends, said bearing shell having radially extending flanges positioned so as to restrict the opening between portions of said shell and the crankpin journal surfaces of said bearing block to tend to retain a lubricant film between said bearing shell and bearing block crankpin journal surfaces to provide a means for damping impact forces applied to said crankpin.

15. In combination, a crankpin having an oil supply bore extending therethrough, a perforated bearing shell mounted concentrically about and spaced from said crankpin, and a bearing block structure mounted on said bearing shell and adapted to be slidably connected between a pair of spaced slideways comprising a pair of complementary bearing block portions, each bearing block portion having a pair of spaced parallel ends provided with surfaces adapted to be slidably-engaged with said slideways and a side face, said side face being formed with an opening providing a journal surface to seat a portion of said crankpin bearing shell, means connecting said bearing block portion together, anchor pin means mounted on the journal surface of each bearing block portion adapted to non-rotatably support said bearing shell on said bearing block structure in spaced relation to the crankpin journal surface formed therein, lubricant receiving channels formed along the crankpin journal surfaces of said block portions, and bores connecting said lubricant receiving channels to the bearing surfaces on the block ends.

ARTHUR J. SLEMMONS.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,207,071 Parsons Dec. 5, 1916 1,578,228 Yearsley Mar. 23, 1926 1,710,721 Bosmans Apr. 30, 1929 FOREIGN PATENTS Number Country Date 14,793 Great Britain 1899 211,645 Germany July 8, 1909 

